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First check that there isn't any PLA in there that is preventing you from tightening it. If there is, try heating it up and remove as much as you can and then, while it's still hot, try tightening the parts together again.

If it isn't old PLA getting in the way then perhaps the brass tube has gotten screwed in a bit too far. Back it out a few turns, then screw on the nozzle tight and finally tighten the brass tube back up so that it connects with the nozzle. It should look like this when you're done:

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We're not only trying to always make Ultimaker Cura better with the usual new features and improvements we build, but we're also trying to make it more pleasant to operate. The interface was the focus for the upcoming release, from which we would already like to present you the first glance.

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Designing for light-weight parts is becoming more important, and I’m a firm believer in the need to produce lighter weight, less over-engineered parts for the future. This is for sustainability reasons because we need to be using less raw materials and, in things like transportation, it impacts the energy usage of the product during it’s service life.